There was this really cool Hemholtz plot of the path of magnetic north during the last geomagnetic reversal from wander paths of sediments in the Black Sea. Had a sense that it was avoiding the geoid gravity high knob in Indonesia and decided to plot it on the geoid. From the plot it was immediately clear the thing was hopping between gravity lows. Still pondering what this means but the field is very weak during these excursions and it’s almost like the only place there could even be a field was where there was less mass of crust, mantle, etc. to interfere.